E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/31
E21B 43/22 (2006.01) C09K 8/584 (2006.01)
Patent
CA 1105694
F-9580 SURFACTANT WATERFLOODING EMPLOYING AMPHOTERIC SULFONIUM SULFONATES Abstract of the Disclosure Waterflood process for the recovery of oil from a subterranean oil reservoir involving injecting into the reservoir an aqueous solution of an amphoteric surfactant having an inner sulfonium group linked to a terminal sulfonate group. The amphoteric sulfonium sulfonate may be employed in relatively low concentrations within the range of 0.001-0.1 weight percent and injected in an aqueous slug of at least 0.5 pore volume. The invention may be applied in situations in which the reservoir waters and/or the water employed in formulating the surfactant solution contain relatively high amounts of divalent metal ions. Specifically disclosed sulfonium sulfonates include dodecylmethylsulfonium propane sulfonate, tetradecylmethyl- sulfonium propane sulfonate, and hexadecylhydroxyethylsulfonium propane sulfonate. -1-
326596
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
LandOfFree
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